Summary:
Within this commit a new AbstractLogger was introduced
which allows to handle log messages at an application level.

Log messages are passed up to Java using a JNI callback.

This allows a Java-Developer to use common Java APIs for log
messages e.g. SLF4J, LOG4J, etc. Within this commit no new
dependencies were introduced, which keeps the RocksDB API clean
and doesn`t force a developer to use a predefined high-level Java API.

Another feature is to dynamically set a custom loggers verbosity at
runtime using its public method `setInfoLogLevel` and to retrieve
the currently active level using the `infoLogLevel` method.

Test Plan:
make clean jclean rocksdbjava jtest
mvn -f rocksjni.pom package

Reviewers: adamretter, ankgup87, yhchiang

Subscribers: dhruba

Differential Revision: https://reviews.facebook.net/D34755

Within this commit a new AbstractLogger was introduced
which pushes info log messages all the way up to Java.

- Resolve problem while using a temporary data folder
- Fix test

- NativeLibraryLoader Test
- EnvironmentTest Bugfix

Summary:
As the C++ part exposes now SequenceNumber retrieval
for Snapshots we want this obviously also in the Java API.

Test Plan:
make rocksdbjava
make jtest
mvn -f rocksjni.pom test

Reviewers: yhchiang, adamretter, ankgup87

Subscribers: dhruba

Differential Revision: https://reviews.facebook.net/D32571

Summary:
- AssertionError when initialized with Non-Direct Buffer
- Tests + coverage for DirectSlice
- Slice sigsegv fixes when initializing from String and byte arrays
- Slice Tests

Test Plan: Run tests without source modifications.

Reviewers: yhchiang, adamretter, ankgup87

Subscribers: dhruba

Differential Revision: https://reviews.facebook.net/D30081

reference

builds to be deleted

Summary:
RocksDB supports two ways of saving snapshots. In
memory and on disk. The later was added with this
pull request to RocksJava.

Test Plan:

Reviewers:

Subscribers:

Prevent non exist error message while executing
clean twice.

- Updated the BackupableDBOptions functionality to 3.8.0.
- Aligned Options implementation with remaining source code.
- Invented test-case.

Previous to this commit too much targets got dependencies
on javadocs target.

Introduced one additional target "javalib" which resolves
that situation. JavaDoc will now be generated once while
executing a task with prefix "rocksdbjava".

- Remove JNI includes on clean
- Remove target folder generated by Maven
- Remove shared object
- Remove jar

It's now possible to set a LogLevel in Options and
DBOptions to control LOG verbosity.

+ 7% coverage + 3% branch coverage

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[RocksJava] Extend Options with ColumnFamilyOptions implementation ColumnFamilyOptions implementation with tests
[RocksJava] Extended ColumnFamilyTest

Summary: Options Refactoring split part 3

Test Plan:
make rocksdbjava
make jtest

Reviewers: yhchiang, ankgup87

Subscribers: dhruba

Differential Revision: https://reviews.facebook.net/D28023

RocksJava now supports also flush functionality of
RocksDB.